Jeffrey Boyce, 30, was arrested in the Greenbrae area of Marin County on Monday night. Police say he carjacked a man and forced him to drive to a church around 4:30 p.m. in neighboring Sonoma County. The man got away.

Rohnert Park police Sgt. Aaron Johnson says he later tried to carjack a woman in the Greenbrae area. The woman escaped, and Boyce was arrested a short time later.

Johnson says Boyce's mother told police her son is mentally ill. He says a truck that Boyce was driving before the carjacking contained more than 200 rounds of assault-rifle-style bullets and a loaded .22-caliber rifle.